Influence　of　two　kinds　of　industrial　ashes　with　high　carbon　and　calcium-rich　as　additives　(drying　ash　and　fly　ash)　on　slagging　characteristics　for　blends　of　high　and　low　sodium　coals　was　studied　in　detail.　Experiments　were　performed　including　ash　fusion　temperature　tests,　ashing　for　blending　coals　with/without　additives　in　a　fixed　bed　furnace　and　slagging　on　un-cooled　probe　in　a　drop　tube　furnace.　The　results　show　that　there　is　a　large　amount　of　amorphous　silicon　at　1000　during　combustion　of　raw　blending　coals,　which　easily　leads　to　low-temperature　eutectic　reaction　at　higher　temperature.　Adding　5%　fly　ash　can　raise　soften　temperature　of　the　blended　coal　ashes　by　100　,　and　mass　ratio　of　CaO　to　SiO2　in　ashes　reaches　up　to　2.5.　Dicalcium　silicate　and　grossular　are　newly　generated,　which　effectively　reduce　the　slagging　propensities.　The　main　phase　in　slag　samples　collected　on　the　probe　is　identified　as　gehlenite　after　adding　two　industrial　ashes　into　raw　blending　coals.　The　addition　of　two　typical　ashes　can　transform　amorphous　silicon　into　its　crystalline　mineral　phase,　inhibit　formation　of　low-temperature　eutectics.　In　contrast　to　the　case　of　adding　5%　fly　ash,　impact　of　adding　5%　drying　ash　into　raw　blending　coals　on　slagging　tendency　of　the　ash　particles　on　un-cooled　probe　is　insignificant.　Copyright　©2021　Editorial　Dept.　of　Journal of Fuel Chemistry and Technology.　All　rights　reserved.